Abstract: A wear-indicating system includes a wear-indicating mark applied to a portion of a surface edge margin of an internal component of a turbine. The wear-indicating mark is visually discernible from the surface edge margin through boroscopic inspection. An inner extent of the wear-indicating mark is spaced a pre-selected distance from the surface edge.

Abstract: A joint assembly for a steam turbine includes a threaded stud extending through mating openings in a first flange of the first half shell and in a second flange of the second half shell; a first nut threaded onto a first end of the threaded stud adjacent the first flange; a screw coupling the first nut to the first flange; and a dowel extending between and into the first flange and the first nut so as to bear a substantial portion of a torque load applied to the first nut compared to the screw.

Abstract: A wear-indicating system includes a wear-indicating mark applied to a portion of a surface edge margin of an internal component of a turbine. The wear-indicating mark is visually discernible from the surface edge margin through boroscopic inspection. An inner extent of the wear-indicating mark is spaced a pre-selected distance from the surface edge.

Abstract: A system for aligning a shell of a rotary machine with a standard along an axial centerline and a transverse centerline of the rotary machine includes a pair of generally L-shaped hooks on the shell; a generally T-shaped member comprising a base, a post, and a cross member provided to the standard; a pair of axial gib keys provided on opposing sides of the cross member, at least one of the axial gib keys configured to engage at least one of the L-shaped hooks and the other being configured to engage the shell; and a pair of transverse gib keys provided on opposing sides of the post, each transverse gib key configured to engage a respective L-shaped hook.

Abstract: A joint assembly for a steam turbine includes a threaded stud extending through mating openings in a first flange of the first half shell and in a second flange of the second half shell; a first nut threaded onto a first end of the threaded stud adjacent the first flange; a screw coupling the first nut to the first flange; and a dowel extending between and into the first flange and the first nut so as to bear a substantial portion of a torque load applied to the first nut compared to the screw.

Abstract: A method of fabricating a steam turbine nozzle box is provided, wherein the method includes forming an annular chamber defined by a radially outer wall and a radially inner wall and coupling a plurality of inlets in flow communication with the annular chamber such that steam is discharged from each of the plurality of inlets into the chamber at an oblique discharge angle with respect to an inlet axial centerline.

Abstract: A system for aligning a shell of a rotary machine with a standard along an axial centerline and a transverse centerline of the rotary machine includes a pair of generally L-shaped hooks on the shell; a generally T-shaped member comprising a base, a post, and a cross member provided to the standard; a pair of axial gib keys provided on opposing sides of the cross member, at least one of the axial gib keys configured to engage at least one of the L-shaped hooks and the other being configured to engage the shell; and a pair of transverse gib keys provided on opposing sides of the post, each transverse gib key configured to engage a respective L-shaped hook.

Abstract: An apparatus for routing fluid in a steam turbine is provided. The steam turbine includes a stage comprising a plurality of buckets secured to a rotor. The rotor is configured to rotate in response to a first volume of fluid flowing from an inlet passageway past the plurality of buckets. The apparatus includes a member having a fluid passageway extending therethrough. The fluid passageway includes a first end in fluid communication with a discharge side of the stage of the steam turbine. A second volume of fluid comprising a portion of the first volume of fluid is received into the fluid passageway at the discharge side of the stage and is discharged out of an outlet of the fluid passageway. The outlet is in fluid communication with a region between an upstream side of the stage and a sealing member disposed against the rotor. The region receives a third volume of leakage fluid from the upstream side of the stage.

Abstract: Disclosed is a system for aligning and sealing a turbine shell assembly an first shell assembly including at least one first shell segment, a second shell assembly including a tongue extending therefrom, a groove defined by the first shell assembly, the groove configured to mate with the tongue extending from the second shell assembly, at least one key structure disposable in the groove, the at least one key structure being associable with at least one surface of the at least one first shell segment, and at least partially sealable with a sealing surface of the tongue, and a tapered surface of the groove that is associable with at least a portion of the at least one key structure.

Abstract: Disclosed is a system for aligning and sealing a turbine shell assembly an first shell assembly including at least one first shell segment, a second shell assembly including a tongue extending therefrom, a groove defined by the first shell assembly, the groove configured to mate with the tongue extending from the second shell assembly, at least one key structure disposable in the groove, the at least one key structure being associable with at least one surface of the at least one first shell segment, and at least partially sealable with a sealing surface of the tongue, and a tapered surface of the groove that is associable with at least a portion of the at least one key structure.

Abstract: A method of fabricating a steam turbine nozzle box is provided, wherein the method includes forming an annular chamber defined by a radially outer wall and a radially inner wall and coupling a plurality of inlets in flow communication with the annular chamber such that steam is discharged from each of the plurality of inlets into the chamber at an oblique discharge angle with respect to an inlet axial centerline.

Abstract: An apparatus for routing fluid in a steam turbine is provided. The steam turbine includes a stage comprising a plurality of buckets secured to a rotor. The rotor is configured to rotate in response to a first volume of fluid flowing from an inlet passageway past the plurality of buckets. The apparatus includes a member having a fluid passageway extending therethrough. The fluid passageway includes a first end in fluid communication with a discharge side of the stage of the steam turbine. A second volume of fluid comprising a portion of the first volume of fluid is received into the fluid passageway at the discharge side of the stage and is discharged out of an outlet of the fluid passageway. The outlet is in fluid communication with a region between an upstream side of the stage and a sealing member disposed against the rotor. The region receives a third volume of leakage fluid from the upstream side of the stage.

Abstract: A nozzle box includes a torus, bridge ring and nozzle ring portions wherein steam flowing generally circumferentially in the torus portion is redirected for flow generally axially by the bridge ring portion. The steam exiting the bridge ring portion flows into nozzles formed by adjacent partitions of the nozzle ring portion. Bridges in the bridge ring portion are tangentially leaned to exactly match the angle of inclination of the leading edges of the axially adjacent partitions at like circumferential locations. For strength purposes, there are two bridges for each partition. Every other bridge axially registers with the leading edge of the axially downstream partition matching its angle while remaining bridges are equally spaced between the aligned bridges. In this manner, the steam flow is straightened by the bridges to match the angle of the leading edge of the nozzle partitions with consequent reduction of passage area loss.

Abstract: An exhaust hood for a turbine includes a shell casing, an external support structure, conical corner plates, and a butterfly plate. The shell casing includes an inner surface and an outer surface. The external support structure is coupled to the shell casing outer surface, and provides structural support to said shell casing. The butterfly plate is coupled to the shell casing inner surface for channeling flow into the exhaust hood and subsequently into the condenser. The butterfly plate has a substantially elliptically-shaped cross-sectional profile that facilitates reducing flow separation losses of steam flowing therethrough into the exhaust hood.

Abstract: An inner shell of a steam turbine has discrete arcuate steam outlet ports through an axial face. In axial opposition is a nozzle ring including a pair of nozzle ring segments joined at a horizontal midline. At the midline joint, split partitions are employed to provide a full 360° discharge through the nozzle ring. The split partitions are split in an axial direction to define discrete partition portions in each of the nozzle ring segments adjacent the midline joint.

Abstract: A turbine shell assembly includes radially inner and outer shell components; axial alignment fits on the inner and outer shell components, each alignment fit comprising a male fit component on one of the inner and outer shell components and a female fit component on the other of the inner and outer shell components, the female fit component comprising a pair of flanges forming a U-shaped channel with opposed faces, and the male fit component comprising a projection received within the U-shaped channel; and a pair of axial alignment keys, each key having a mounting flange for securement along an outer edge of a respective one of the pair of flanges and an alignment flange engaged along a respective one of the opposed faces.